JP2021121702A - Napped artificial leather - Google Patents

Abstract

To provide a high-quality napped artificial leather that is colored in a dark color, wherein the napped artificial leather is excellent in dark color development, light resistance, and color migration resistance, and maintains a high peel strength.SOLUTION: There is provided a napped artificial leather including: a non-woven fabric containing polyester fibers having an average fineness of 0.07 to 0.9 dtex; and an elastic polymer applied in the non-woven fabric. The non-woven fabric is an entangled body of a fiber bundle of polyester fibers. The elastic polymer contains a first elastic polymer that is present outside the fiber bundle, and a second elastic polymer that is present inside the fiber bundle. The polyester fibers contain 0.5 to 10 mass% of a dark color pigment, a content ratio of the second elastic polymer is 0.1 to 3 mass%. The napped artificial leather has a napped surface on which the polyester fibers on at least one side thereof are napped, and the napped surface has a lightness L* value based on the L*a*b* color system, of ≤20. The napped artificial leather has a grade of color difference, determined using a Grey scale for assessing staining in an evaluation of color migration to a multifiber adjacent fabric (co-woven fabric No.1; the same applied to the following) during pressurization under heating in a wet state under a load of 4 kPa at 200°C for 60 seconds, of 4 or more.SELECTED DRAWING: None

Description

The present invention relates to darkly colored napped artificial leather.

Standing-like artificial leather having a fine fluffy feeling, such as suede-like artificial leather and nubuck-like artificial leather, is known. Fleece-like artificial leather is used as a surface material for clothing, shoes, furniture, car seats, miscellaneous goods, etc., and as a surface material for mobile phones, mobile devices, housings of home appliances, etc. Such fluffy artificial leather is usually used in color.

The fluffy artificial leather is obtained by buffing the fibers of the surface layer of the artificial leather base material obtained by containing a polymer elastic body such as polyurethane inside a non-woven fabric of ultrafine fibers. As the non-woven fabric of ultrafine fibers used for napped artificial leather, the non-woven fabric of ultrafine fibers of polyester is preferably used because of its excellent mechanical properties, durability, and texture.

Disperse dyes are widely used to color napped artificial leather, including non-woven polyester microfibers. However, when a non-woven fabric of polyester ultrafine fibers is dyed with a disperse dye, it is necessary to dye a large amount of the disperse dye in order to color it in a deep color. In this case, there is a problem that the light resistance and the color transfer resistance of the napped artificial leather are likely to be lowered.

In order to color the leather-like sheet, dyeing with a cationic dye having excellent dyeing fastness has also been attempted. For example, Patent Document 1 below is a cationic dye dyeable polyurethane obtained by using a sulfonic acid group-containing diol obtained by substantially substituting the acid component of sulfoisophthalic acid with a specific diol as a monomer. And a cation dye dyeable leather-like sheet containing a fiber structure.

Cationic dyeable polyester fibers are also known. For example, in Patent Document 2 below, as a copolymerization component, a metal salt (A) of sulfoisophthalic acid and a quaternary phosphonium salt or a quaternary ammonium salt (B) of sulfoisophthalic acid are contained in the acid component in an amount of 3.0 ≦ A + B ≦. Disclosed is a fabric dyed with a cationic dye, which comprises a copolyester fiber containing 5.0 (mol%), 0.2 ≦ B / (A + B) ≦ 0.7.

Further, in order to color the fluffy artificial leather, the following Patent Document 3 describes 0.1 to 8% by mass of a pigment on fibers such as polyester fibers of 0.2 dtex or less and 1 to 20% by mass of a pigment on a polymer elastic body. Disclosed is a napped artificial leather in which the fiber and the polymer elastic body are colored with a pigment, and the mass ratio of the fiber and the polymer elastic body is 85/15 to 40/60.

Japanese Unexamined Patent Publication No. 6-192968 Japanese Unexamined Patent Publication No. 2010-242240 Japanese Patent No. 4233965

When a leather-like sheet containing a cationic dye dyeable polyurethane and a fiber structure disclosed in Patent Document 1 is dyed with a cationic dye, it is difficult to dye if the fiber structure does not have the cationic dye dyeability. Become. As a result, there is a problem that the color of polyurethane and the color of the fiber structure are different, resulting in a low-quality leather-like sheet having a strong two-color feeling. Further, when polyurethane dyeable with a cationic dye is dyed in a dark color with a cationic dye, there is a problem that color transfer to other articles is likely to occur and the light resistance is also lowered.

Further, the cationic dye dyeable polyester fiber disclosed in Patent Document 2 contains a copolymerization unit that serves as a dyeing seat for dyeing the cationic dye. Cationic dye dyeable polyester fibers have a problem of low fiber strength. As a result, the napped artificial leather containing the cation dye dyeable polyester fiber has a problem that the peeling strength is low and the ultrafine fibers are easily removed when the surface is rubbed.

Further, in the case of napped artificial leather containing a polymer elastic body containing a pigment disclosed in Patent Document 3, when it is colored in a dark color, the pigment in the polymer elastic body is transferred to another article. There was a problem that it was easy to do and the light resistance was lowered. In particular, when the content ratio of the polymer elastic body is high or when the concentration of the pigment in the polymer elastic body is high, the above problem is likely to occur remarkably. Furthermore, when the content ratio of the polymer elastic body is high, the mass ratio of the fibers is relatively low, so that the peeling strength is lowered, a rubber-like peculiar repulsive feeling is produced, and the fibers have a fluffy feeling. There was a tendency that low-grade fluffy artificial leather could be obtained because it was inferior or the color of the fiber and the color of the polymer elastic body were different and the two-color feeling became stronger.

The present invention has solved the above-mentioned problems and maintained high peeling strength while being excellent in dark color development, light resistance and color transfer resistance in dark-colored napped artificial leather. , An object of the present invention is to provide high-quality fluffy artificial leather.

One aspect of the present invention includes a non-woven fabric containing polyester fibers having an average fineness of 0.07 to 0.9 dtex and a polymer elastic body imparted to the non-woven fabric, and the non-woven fabric is an entangled fiber bundle of polyester fibers. The polymer elastic body includes a first polymer elastic body existing outside the fiber bundle and a second polymer elastic body existing inside the fiber bundle, and the polyester fiber contains 0.5 dark pigment. It contains 10% by mass, has a fluffy surface on which at least one polyester fiber is fluffed, and the fluffy surface has a ^{lightness L * value ≤ 20 based on the L * a *} b * color system, and is a non-woven fabric. Color difference grade judgment using contaminated gray scale for color transfer evaluation during heating and pressurization under the conditions of wet cloth (mixed weave No. 1, the same below), load 4 kPa, 200 ° C, 60 seconds is 4th grade or higher. It is a napped artificial leather.

Another aspect of the present invention is a polymer and a polymer which are entangled fiber bundles of isophthalic acid-modified polyester fibers having an average fineness of 0.07 to 0.9 dtex containing 0.5 to 10% by mass of carbon black. It has at least one fluffy surface on which the isophthalic acid-modified polyester fiber is fluffed, including the provided polymer elastic body, and the fluffy surface has a ^{lightness L *} value ≤ ^{based on the L * a *} b * color system. 20 and undyed or dyed with a gold-containing dye or a sulfide dye, the polymer elastic body is present inside the first polymer elastic body and the fiber bundle existing outside the fiber bundle. The content ratio of the polymer elastic body is 0.1 to 15% by mass, and the content ratio of the second polymer elastic body is 0.1 to 3% by mass. It is a napped artificial leather having a peeling strength of 3 kg / cm or more.

According to the present invention ^{, a high-quality fluffy artificial leather that develops a strong dark color with a lightness L *} value ≤ 20, has excellent light resistance and color transfer resistance, and maintains high peeling strength can be obtained. Be done.

When the polyester fiber is colored with a pigment, if the fineness is too low, it is difficult to develop a dark color unless a large amount of the pigment is blended. Further, when a large amount of pigment is blended when the fineness is low, the mechanical properties of the polyester fiber are lowered and the peel strength is lowered. Further, when the non-woven fabric contains a large amount of the polymer elastic body, a two-color feeling is generated due to the difference in the color of the polymer elastic body from the color of the polyester fiber, and the mass ratio of the polyester fiber becomes relatively low. As a result, the peeling strength tends to be low. Moreover, when the fineness of the polyester fiber is high, the surface becomes rough.

According to such a fluffy artificial leather, it is possible to obtain a high-quality fluffy artificial leather having excellent dark color development property, light resistance, color transfer resistance and high peeling strength. In particular, when the multi-fiber mixed woven fabric is wet, heat or pressure is applied because the color difference series judgment of the color transferability evaluation at the time of heating and pressurizing under the conditions of a load of 4 kPa, 200 ° C., and 60 seconds is 4th grade or higher. Color transfer is sufficiently suppressed when it is adhered to another article or when it comes into contact with a light-colored article. In particular, color transfer can be suppressed even when, for example, it is brought into contact with another article and heat-treated at 150 to 200 ° C. to adhere it, or when it is brought into contact with a vinyl chloride film that easily adheres to a polymer elastic body.

The content ratio of the polymer elastic body contained in the fluffy artificial leather is 0.1 to 15% by mass, so that the mass ratio of the fibers does not become too low, so that high peeling strength can be maintained, and the peeling strength can be maintained. , The two-color feeling due to the difference between the color of the fiber and the color of the polymer elastic body is unlikely to appear. As a result, a fluffy artificial leather having an excellent balance between high-quality appearance and touch, color transfer resistance, and high peeling strength can be obtained.

The non-woven fabric is an entanglement of fiber bundles of polyester fibers, and the polymer elastic body is a first polymer elastic body existing outside the fiber bundle and a second polymer elastic body existing inside the fiber bundle. And include. With such a configuration, high peeling strength can be maintained even when the content ratio of the polymer elastic body is low. The content ratio of the second polymer elastic body is 0.1 to 3% by mass.

Further, it is preferable that the polymer elastic body does not contain a dark pigment or is contained in the range of 0 to 20% by mass from the viewpoint of particularly excellent color transfer resistance.

Further, it is preferable that the napped artificial leather is not dyed, or is dyed with a gold-containing dye or a sulfur dye, from the viewpoint of not lowering the color transfer resistance.

Further, it is preferable that the dark color pigment contains carbon black because it is particularly excellent in light resistance and color transfer resistance.

Further, it is preferable that the polyester fiber is an isophthalic acid-modified polyester fiber from the viewpoint that high peeling strength can be easily maintained.

In addition, for napped artificial leather, the color difference class can be determined using a gray scale for color transfer in the color transfer property evaluation under the conditions of drying on a multi-fiber mixed woven fabric, a load of 4 kPa, 200 ° C., and 60 seconds. Grade 4 or higher is preferable because color transfer can be further suppressed when the product is used in an application in which the product is brought into contact with another article and heat-treated at 150 to 200 ° C. for adhesion.

Further, in the light fastness test for ultraviolet carbon arc lamp light conforming to JIS L0842, it is preferable that the color difference series determination using the gray scale for discoloration and fading is grade 4 or higher from the viewpoint of excellent light resistance.

In addition, the color difference of the vinyl chloride film before and after the color transfer in the evaluation of the color transferability to the vinyl chloride film under the conditions of a load of 750 g / cm ^{2 , 50 ° C. and 16 hours is ΔE *} ≤ 2.0. It is preferable because it is particularly excellent in color transfer resistance when it is used in an application in which the film is brought into contact with the film and heat-treated at 150 to 200 ° C. for adhesion.

According to the present invention, in a fluffy artificial leather colored in a strong dark color, a fluffy artificial leather having high light resistance, color transfer resistance and peeling strength, and high quality can be obtained.

An embodiment of a fluffy artificial leather according to the present invention will be described in detail with reference to an example of a method for producing the same.

In the method for producing napped artificial leather of the present embodiment, first, a non-woven fabric which is a fiber entangled material containing polyester fibers having an average fineness of 0.07 to 0.9 dtex containing 0.5 to 10% by mass of a dark pigment is used. , Prepare an artificial leather base material containing a polymer elastic body attached to the non-woven fabric. Such an artificial leather base material is manufactured, for example, as follows.

First, an entanglement of ultrafine fiber-generating fibers for forming a non-woven fabric of polyester fibers having an average fineness of 0.07 to 0.9 dtex containing 0.5 to 10% by mass of a dark pigment is produced.

In the production of the entangled body of the ultrafine fiber generation type fiber, first, the fiber web of the ultrafine fiber generation type fiber is produced. Examples of the method for producing the fiber web include a method in which ultrafine fiber generation type fibers are melt-spun and collected as long fibers without intentionally cutting them, or a known entanglement after cutting into staples. An example is a method of performing a combination process. The long fiber is a continuous fiber or filament that has not been cut to a predetermined length, and the length thereof is, for example, 100 mm or more, further 200 mm or more, so that the fiber density can be sufficiently increased. It is preferable because it can be done. The upper limit of the long fiber is not particularly limited, but may be a fiber length of several m, several hundred m, several km or more continuously spun. Among these, it is particularly preferable to produce a long fiber web from the viewpoint that it is easy to reduce the content of the polymer elastic body contained in order to prevent the fiber from coming off because the fiber is less likely to come off. In the present embodiment, as a typical example, a case where a long fiber web is manufactured will be described in detail.

The ultrafine fiber generation type fiber is a fiber that forms ultrafine fibers having low fineness by subjecting the fibers after spinning to a chemical post-treatment or a physical post-treatment. As a specific example, for example, in the fiber cross section, an island component resin having a domain different from that of the sea component resin is dispersed in the sea component resin as a matrix, and by removing the sea component resin, the sea component resin is dispersed. Examples thereof include sea-island type composite fibers that form fiber bundle-shaped ultrafine fibers mainly composed of island component resin. Further, for example, a plurality of different resin components are alternately arranged on the outer periphery of the fiber to form a petal shape or a superposed shape, and each resin component is separated by peeling by a physical treatment to form a bundle of ultrafine fibers. Examples thereof include peeling and split type composite fibers to be formed. According to the sea-island type composite fiber, fiber bundle-shaped ultrafine fibers are formed. In the present embodiment, a case where a sea-island type composite fiber is produced as an ultrafine fiber generation type fiber as a typical example will be described in detail.

The long fiber web of the sea-island type composite fiber is formed by melt-spinning the sea-island type composite fiber and collecting the long fiber as it is on the net without cutting.

Specific examples of polyester, which is an island component resin for expressing polyester fibers in sea-island type composite fibers, include polyethylene terephthalate (PET), isophthalic acid-modified PET, sulfoisophthalic acid-modified PET, polybutylene terephthalate, and polyhexa. Aromatic polyesters such as methylene terephthalate; and aliphatic polyesters such as polylactic acid, polyethylene succinate, polybutylene succinate, polybutylene succinate adipate, and polyhydroxybutyrate-polyhydroxyvariate resin can be mentioned. These may be used alone or in combination of two or more.

Among polyesters, isophthalic acid-modified PET is preferable because it has an excellent balance between melt-spinnability and fiber strength, and it is easy to reduce the amount of polymer elastic material contained in order to prevent fibers from coming off. The proportion of the modified monomer in the modified PET is preferably 0.1 to 30 mol%, more preferably 0.5 to 15 mol%, and particularly preferably 1 to 10 mol%. Further, the island component resin may be a polyamide such as polyamide 6, polyamide 66, polyamide 10, polyamide 11, polyamide 12, polyamide 6-12, etc. in combination with polyester as long as the effect of the present invention is not impaired; polypropylene, polyethylene, It may contain a polyolefin such as polybutene, polymethylpentene, and chlorine-based polyolefin.

Polyesters are colored with dark pigments to obtain darkly colored polyester fibers. The dark color pigment means a pigment capable of reducing ^{the lightness L *} value of a natural color polyester to which no pigment is added. Specific examples of such dark pigments include black pigments such as carbon black, blue pigments such as ultramarine blue and procyanine blue (ferrocyanine iron potassium), red pigments such as lead tan and iron oxide red, and yellow lead. , Inorganic pigments such as yellow pigments such as zinc yellow (1 type of zinc yellow, 2 types of zinc yellow), phthalocyanine type, anthraquinone type, quinacridone type, dioxazine type, isoindolinone type, isoindrin type, indigo type, Examples thereof include condensed polycyclic organic pigments such as quinophthalone type, diketopyrrolopyrrole type, perylene type and perinone type, and insoluble azo type organic pigments such as benzimidazolone type, condensed azo type and azomethin azo type. These may be used alone or in combination of two or more. Among these, carbon black is preferable because it is easy to color a strong dark color such as ^{a lightness L * value ≤ 20 and is excellent in light resistance.}

The content ratio of the dark pigment in the polyester composition containing the dark pigment that forms the polyester fiber is 0.5 to 10% by mass, and is appropriately selected according to the average fineness of the polyester fiber, the target color, and the type of pigment. Will be done. For example, 1 to 10 mass% in the average fineness of the polyester fiber is colored in the lightness L ^* value ≦ 20 in the case of 0.07～0.5Dtex, to color the L ^* value ≦ 18 4 to 10 It is preferably mass%. Also, 1-8% by weight to the average fineness of the polyester fiber is colored in the L ^* value ≦ 20 at 0.3～0.9Dtex, 4-8% by mass for coloring the L ^* value ≦ 18 It is preferable to have. When the content ratio of the dark pigment in the polyester composition exceeds 10% by mass, the mechanical properties and melt spinnability of the obtained polyester fiber are deteriorated.

Further, in the polyester composition forming the polyester fiber, for the purpose of adjusting the spinning process and the hue of the obtained artificial leather suede, for example, with a dark pigment, as long as the effect of the present invention is not impaired, for example, White pigments such as zinc flower, lead white, lithopone, titanium dioxide, precipitated barium sulfate and barite powder, and silica such as colloidal silica may be blended. Further, a weather resistant agent, a fungicide, a hydrolysis inhibitor, a lubricant, fine particles, a friction resistance adjusting agent and the like may be blended as long as the effects of the present invention are not impaired.

As the sea component resin in the sea island type composite fiber of the present embodiment, a thermoplastic resin having a different solubility in a solvent or a decomposition property in a decomposing agent from the island component resin is selected. Specific examples of the sea component resin include water-soluble polyvinyl alcohol-based resin, polyethylene, polypropylene, polystyrene, ethylene propylene resin, ethylene vinyl acetate resin, styrene ethylene resin, styrene acrylic resin, and the like.

The sea-island type composite fiber is obtained by cooling the molten sea-island type composite fiber discharged from the mouthpiece of the melt spinning machine with a cooling device, and further pulling and thinning the fiber to the desired fineness by a suction device such as an air jet nozzle. Manufactured by melt spinning. The traction thinning is preferably carried out by a high-speed air flow such that the spinning speed is as high as the take-up speed of 1000 to 6000 m / min, more preferably 2000 to 5000 m / min. Then, by depositing the traction-thinned long fibers on a collection surface such as a mobile net, a long fiber web of sea-island type composite fibers can be obtained.

The average fineness of the sea-island type composite fiber is not particularly limited, but 0.5 to 10 dtex, more preferably 0.7 to 5 dtex is preferable from the viewpoint of excellent formability of the non-woven fabric. Further, the average area ratio of the sea component resin to the island component resin in the cross section of the sea island type composite fiber is 5/95 to 70/30, and further, 10/90 to 50/50, which makes it easy to form the sea island structure. Is preferable. The number of island component resin domains in the cross section of the sea-island type composite fiber is not particularly limited, but is preferably 5 to 1000, more preferably about 10 to 300 from the viewpoint of industrial productivity.

If necessary, the long fiber web may be pressed and partially crimped to stabilize the shape. The basis weight of the long fiber web thus obtained is not particularly limited, but is preferably in the range of ^{, for example, 10 to 1000 g / m 2.}

Next, the obtained long fiber web is subjected to an entanglement treatment to produce a sea-island type composite fiber entangled web. As a specific example of the entanglement treatment of the long fiber web, for example, after stacking a plurality of layers of the long fiber web in the thickness direction using a cloth wrapper or the like, at least one or more barbs are simultaneously or alternately formed on both sides. Examples include needle punching and water flow entanglement processing under penetrating conditions. Further, an oil agent or an antistatic agent may be applied to the long fiber web at any stage from the spinning process of the sea-island type composite fiber to the entanglement treatment.

If necessary, the sea-island type composite fiber entangled web may be subjected to a heat shrinkage treatment in order to make the entangled state of the long fibers dense. Specific examples of the heat shrinkage treatment include, for example, a method in which the entangled web of the sea-island type composite fiber is brought into contact with steam, and after water is applied to the entangled web of the sea-island type composite fiber, the water is heated by heating air, infrared rays, or the like. A method of heating by electromagnetic waves can be mentioned. The change in the basis weight of the sea-island type composite fiber entangled web in the heat shrinkage treatment is 1.1 times (mass ratio) or more, 1.3 times or more, and twice as much as the basis weight before the shrinkage treatment. Below, it is preferable that it is 1.6 times or less. Further, the entangled web of the sea-island type composite fiber may be densified, and a hot press treatment may be performed to fix the morphology of the entangled web of the sea-island type composite fiber and to smooth the surface. The basis weight of the entangled web of the sea-island type composite fiber thus obtained is preferably in the range of about ^{100 to 2000 g / m 2.}

By removing the sea component resin from the entangled web of the sea-island type composite fiber, a non-woven fabric of polyester fibers having an average fineness of 0.07 to 0.9 dtex containing 0.5 to 10% by mass of a dark pigment can be obtained. As a method for removing the sea component resin from the sea-island type composite fiber, a conventionally known method for forming ultrafine fibers such as treating the entangled web with a solvent or a decomposing agent capable of selectively removing only the sea component resin is used. It can be used without particular limitation. Specifically, for example, when water-soluble PVA is used as the sea component resin, hot water is used as the solvent, and when an alkali-decomposable modified polyester is used as the sea component resin, an aqueous sodium hydroxide solution or the like is used. An alkaline decomposing agent is used.

The average fineness of the ultrafine fibers thus formed is 0.07 to 0.9 dtex, preferably 0.2 to 0.5 dtex, so that it is easy to develop a dark color with a small amount of dark pigment and it is high. A fluffy artificial leather that maintains peeling strength and has excellent quality can be obtained.

In the production of napped artificial leather, prevention of fiber loss and improvement of peeling strength of napped artificial leather before or after converting ultrafine fiber generation type fibers such as sea-island type composite fibers into ultrafine fibers, or both. For the purpose of imparting morphological stability and a sense of fullness to fluffy artificial leather, a polymer elastic material such as polyurethane is impregnated into the internal voids of an entangled web of sea-island type composite fibers or a non-woven fabric of ultrafine fibers.

As the polymer elastic body, polyurethane, an acrylic elastic body or the like conventionally used for producing artificial leather is used without particular limitation. Of these, polyurethane is particularly preferred. Specific examples of polyurethane include polyether polyurethane, polyester polyurethane, polyether ester polyurethane, polycarbonate polyurethane, polyether carbonate polyurethane, polyester carbonate polyurethane and the like. These may be used alone or in combination of two or more. Of these, polycarbonate-based polyurethane is particularly preferable.

Further, it is preferable that the 100% modulus of the polymer elastic body is 1 to 8 MPa from the viewpoint of obtaining a napped artificial leather having excellent suppleness and fullness. If the 100% modulus of the polymer elastic body is too low, when the sea component resin is removed to generate ultrafine fibers, it tends to adhere to the ultrafine fibers and easily hinder the fluffing of the ultrafine fibers, which is too high. In some cases, the fluff tends to have a rough texture.

Further, the polymer elastic body is a colorant such as a pigment such as carbon black or a dye, a coagulation regulator, an antioxidant, an ultraviolet absorber, a fluorescent agent, an antifungal agent, and a penetration as long as the effect of the present invention is not impaired. Agents, antifoaming agents, lubricants, water repellents, oil repellents, thickeners, bulking agents, curing accelerators, foaming agents, water-soluble polymer compounds such as polyvinyl alcohol and carboxymethyl cellulose, inorganic fine particles, conductive agents, etc. It may be contained. When the polymer elastic body contains a pigment, it is preferably 0 to 20% by mass, more preferably 0 to 10% by mass, and particularly preferably 0 to 1% by mass. When the content ratio of the pigment in the polymer elastic body is too high, the peeling strength tends to decrease, and the color transfer resistance tends to decrease.

As a method of imparting a polymer elastic body to the internal voids of the entangled web or the non-woven fabric of the ultrafine fibers, an emulsion, an aqueous solution, or a solution of the polymer elastic body is applied to the entangled web or the non-woven fabric of the ultrafine fibers, for example, a dip. -A method of imparting by coagulating a polymer elastic body by nipling or impregnating with a knife coater, bar coater, or roll coater can be mentioned. Among these, a method in which an emulsion of a polymer elastic body is applied to an entangled web or a non-woven fabric of ultrafine fibers by a dip nip and then coagulated by a drying or wet coagulation method is preferable.

When an emulsion of a polymer elastic body is applied by a dip nip and then coagulated by drying, the emulsion may migrate to the surface layer, so that a uniform packed state may not be obtained. In such cases, adjust the particle size of the emulsion; adjust the type and amount of ionic groups of the polymer elastic, or use an ammonium salt whose pH changes depending on the temperature of about 40 to 100 ° C. Decrease the water dispersion stability; associated heat-sensitive gelation of monovalent or divalent alkali metal salts, alkaline earth metal salts, nonionic emulsifiers, associative water-soluble thickeners, water-soluble silicone compounds, etc. Migration can be suppressed by lowering the water dispersion stability at about 40 to 100 ° C. by using an agent or a water-soluble polyurethane compound in combination.

When the sea-island type composite fiber is subjected to the ultrafine fiber treatment, the fiber bundle-shaped ultrafine fiber is formed by removing the sea component resin. Then, voids are formed inside the fiber bundle of the ultrafine fibers. When the non-woven fabric of the ultrafine fibers after the ultrafine fiber treatment is impregnated with the emulsion of the polymer elastic body, the emulsion of the polymer elastic body is easily impregnated between the ultrafine fibers due to the capillary phenomenon, and the fiber bundle-like ultrafine fibers are easily impregnated. The fibers are strongly restrained, making it difficult for the ultrafine fibers to come off, and the peeling strength is also improved. Therefore, in the production of the napped artificial leather of the present embodiment, after the first polymer elastic body is imparted to the entangled web of the sea-island type composite fiber, the sea-island type composite fiber is subjected to ultrafine fiber treatment to form a fiber bundle. By forming a first intermediate sheet containing a non-woven fabric of ultrafine fibers and further imparting a second polymer elastic body to the first intermediate sheet, a polymer is also formed inside the fiber bundle of the ultrafine fibers. It is particularly preferable to go through a process of imparting an elastic body.

The content ratio of the polymer elastic body in the napped artificial leather is relatively 0.1 to 15% by mass, further 0.5 to 14% by mass, and particularly 2.5 to 12% by mass. Since the mass ratio of the polyester fiber does not become too low, the peeling strength can be maintained high, and the fluffiness of the napped artificial leather becomes good, and it is difficult to obtain a two-color feeling of the polymer elastic body and the polyester fiber. , It is preferable because it is easy to obtain a supple texture with little repulsion. Further, it is preferable because it is excellent in color transfer resistance when it comes into contact with another article at a high temperature, for example, 150 to 200 ° C., or when it comes into contact with an article that easily adheres to a polymer elastic body such as a vinyl chloride film. In the napped artificial leather of the present embodiment, the polyester fibers are finely entwined so as to have a peeling strength of 3 kg / cm or more, and the proportion of the polymer elastic body provided to prevent the polyester fibers from coming off is determined. It is particularly preferable that the height is not too high because the two-color feeling due to the color spots of the polyester fiber and the polymer elastic body can be reduced and the color transfer can be reduced.

Further, the content ratio of the second polymer elastic body existing inside the fiber bundle is preferably 0.1 to 3% by mass because the peeling strength can be easily increased.

In this way, an artificial leather base material obtained by impregnating a non-woven fabric of polyester fibers having an average fineness of 0.07 to 0.9 dtex containing 0.5 to 10% by mass of a dark pigment with a polymer elastic body. Then, the thickness of the artificial leather base material is adjusted by slicing or grinding into a plurality of sheets in the direction perpendicular to the thickness direction as needed, and further, at least one surface is buffed to obtain at least one surface. A raw material for fluffy artificial leather, which is a fluffy surface, can be obtained. The buffing is preferably performed using, for example, sandpaper or emery paper having a count of 120 to 600.

In addition, the polyester fibers contained in the raw material of the fluffy artificial leather are colored with a dark pigment, but if necessary, dyeing is combined for color adjustment, or a liquid in which a pigment and a pigment binder are mixed is impregnated. Then, a treatment of applying the pigment with a binder by drying the pigment may be combined.

As the dyeing, a gold-containing dye, a sulfur dye, a printing dye, a reactive dye, and a cationic dye used for coloring an acidic group-containing polyester fiber can be preferably used. In particular, dyeing with a gold-containing dye or a sulfur dye is preferable because it enables dyeing in which color transfer is suppressed without lowering the fiber strength. As the gold-containing dye and the sulfide dye, the gold-containing dye and the sulfide dye conventionally used for dyeing nylon fibers and polyurethane are not particularly limited. The dyeing method is not particularly limited, and examples thereof include a method of dyeing using a dyeing machine such as a liquid flow dyeing machine, a beam dyeing machine, and a jigger. The dyeing temperature is exemplified by about 60 to 140 ° C. In addition, a dyeing aid such as acetic acid or Glauber's salt may be used for dyeing. Further, the texture may be adjusted by performing a treatment such as a liquid flow without adding a dye. Disperse dyes are not preferable because they tend to be easily migrated. In order not to particularly reduce the color transfer resistance, it is preferable not to dye the napped artificial leather.

Further, the raw machine of the fluffy artificial leather may be further subjected to various finishing treatments, if necessary. Finishing treatments include kneading softening treatment, reverse seal brushing treatment, antifouling treatment, hydrophilic treatment, lubricant treatment, softener treatment, antioxidant treatment, UV absorber treatment, fluorescent agent treatment, flame retardant treatment, and thickening treatment. Examples include colorizing agent treatment.

The fluffy artificial leather includes a non-woven fabric containing polyester fibers having an average fineness of 0.07 to 0.9 dtex containing 0.5 to 10% by mass of a dark pigment, and a polymer elastic body imparted to the inside of the non-woven fabric. .. According to such a fluffy artificial leather, even when the content ratio of the polymer elastic body is low, a high peeling strength, specifically, a fluffy artificial leather having a peeling strength of 3 kg / cm or more can be obtained. Further, according to the non-woven fabric containing polyester fibers having an average fineness of 0.07 to 0.9 dtex containing 0.5 to 10% by mass of a dark pigment, even if the lightness L ^* value ≤ 20, the multi-fiber mixed woven fabric can be obtained. It is possible to obtain a napped artificial leather having a color difference grade determination of 4th grade or higher in the color transferability evaluation during heating under the conditions of wetness, load of 4 kPa, 200 ° C., and 60 seconds.

^{The L *} a ^* b * lightness L ^* value based on the fluffy surface of the fluffy artificial leather is a strong dark color L ^* value ≤ 20, L ^* value ≤ 18, and further L ^* value. ≦ 17 is preferable. In strong dark fluffy artificial leather, the color of the polymer elastic body and the color of the polyester fiber are different and it is easy to get a two-color feeling, but by lowering the content ratio of the polymer elastic body, two colors are likely to appear. The feeling can be suppressed. The lower limit of the L ^* value is not particularly limited, but is preferably 8 or even 10.

Further, the peeling strength of the napped artificial leather is preferably 3 kg / cm or more, more preferably 3.1 kg / cm or more, and particularly preferably 3.5 kg / cm or more.

When the multi-fiber mixed woven fabric of fluffy artificial leather is wet, the color difference series judgment of the color transferability evaluation at the time of heating and pressurizing under the conditions of a load of 4 kPa, 200 ° C., and 60 seconds is 4th grade or higher, preferably 4- It is 5th grade or higher. The fluffy artificial leather of the present embodiment has such a color transfer property at the time of heating and pressurizing, so that it can be applied to various cloths such as cotton, nylon, acetate, hair, rayon, acrylic, silk, and polyester. On the other hand, it has the property that color transfer does not easily occur even when heated and pressed under wet conditions.

Further, the color difference series judgment of the color transferability evaluation at the time of heating and pressurizing under the conditions of drying to a multi-fiber mixed woven fabric, a load of 4 kPa, 200 ° C., and 60 seconds is 4th grade or higher, and 4-5th grade or higher. Is preferable.

Further, according to the napped artificial leather of the present embodiment, the polyester fibers forming the non-woven fabric are colored in a deep dark color with a dark pigment, so that the light fastness test against ultraviolet carbon arc lamp light conforming to JIS L0842 is performed. In the above, it is possible to realize high light fastness such that the color difference class determination using the gray scale for discoloration is 4th grade or higher, and further 4-5th grade or higher.

Further, high vinyl chloride such that the color difference of the vinyl chloride film before and after the color transfer in the evaluation of the color transferability to the vinyl chloride film under the conditions of a load of 750 g / cm ^{2 , 50 ° C. and 16 hours is ΔE * ≦ 2.0.} Color resistance to film can be achieved.

Hereinafter, the present invention will be described in more detail with reference to Examples. The scope of the present invention is not limited to the examples.

[Example 1]
An isophthalic acid-modified polyethylene terephthalate having a degree of modification of 6 mol% was prepared by adding water-soluble thermoplastic polyvinyl alcohol (PVA) as a sea component resin and 5% by mass of carbon black as an island component resin. Then, nozzle holes forming a cross section in which 12 island component resins having a uniform cross-sectional area are distributed in the sea component resin, in which the sea component resin and the island component resin are set to a base temperature of 260 ° C., are arranged in parallel. It was supplied to the mouthpiece for multiple spinning, and the molten fiber was discharged from the nozzle hole. At this time, the resin was supplied while adjusting the pressure so that the mass ratio of the sea component resin and the island component resin was sea component resin / island component resin = 25/75.

Then, the discharged molten fibers were drawn by suction with a suction device so that the average spinning speed was 3700 m / min, and long fibers of sea-island type composite fibers having a fineness of 3.3 dtex were spun. The long fibers of the sea-island type composite fiber were continuously deposited on the movable net and lightly pressed with a metal roll at 42 ° C. to suppress fluffing on the surface. Then, the long fibers of the sea-island type composite fiber were peeled off from the net and passed between the metal roll of the lattice pattern and the back roll at a surface temperature of 55 ° C. and a linear pressure of 200 N / mm. In this way, a long fiber web having a basis weight of 32 g / m ^{2 was produced.}

Next, a stacked web was prepared by stacking long fiber webs in 12 layers so as to have a total basis weight of 380 g / m ² using a cross wrapper device, and an oil for preventing needle breakage was sprayed. Then, using a 6-barb needle with a distance of 3.2 mm from the tip of the needle to the first barb, the weighted web is alternately needle-punched from both sides at a needle depth of 8.3 mm at a needle punch ^{of 3300 punches / cm 2.} An entangled web of 500 g / m ² sea-island type composite fibers was produced. The area shrinkage of the stacked webs by the needle punching process was 70%. Then, the entangled web was subjected to moist heat shrinkage treatment under the conditions of a winding line speed of 10 m / min, 70 ° C., a humidity of 50% RH, and 30 seconds. The area shrinkage of the entangled web by the moist heat shrinkage treatment was 48%.

The first emulsion of the polymer elastic body contains 15% by mass of a self-emulsifying amorphous polycarbonate urethane having a 100% modulus of 3.0 MPa, and 2.5% by mass of ammonium sulfate as a heat-sensitive gelling agent. Polyurethane emulsion was prepared. Then, the moist heat-shrinked entangled web was impregnated with the emulsion of the first polyurethane, and then dried at 150 ° C. to solidify the first polyurethane.

Then, PVA, which is a sea component resin, is dissolved and removed by repeatedly dipping and niping the entangled web containing the sea-island type composite fiber to which the first polyurethane is applied in hot water at 95 ° C. Then it was dried. In this way, a first intermediate sheet containing a non-woven fabric in which fiber bundles containing 12 long polyester fibers having a fineness of 0.2 dtex were three-dimensionally entangled was prepared. The content of the first polyurethane in the fluffy artificial leather was 9.5% by mass.

Then, the first intermediate sheet was sliced and cut in half, and one surface thereof was buffed to adjust the thickness to 0.55 mm to obtain a second intermediate sheet. The second intermediate sheet had a thickness of 0.55 mm, a basis weight of 310 g / m ² , and an apparent density of 0.56 g / cm ³ .

Then, as the emulsion of the second polymer elastic body, a second polyurethane emulsion containing 1% by mass of a self-emulsifying amorphous polycarbonate urethane having a 100% modulus of 3.0 MPa was prepared. Then, the second intermediate sheet was impregnated with the emulsion of the second polyurethane, and then dried at 130 ° C. to solidify the second polyurethane. In this way, a raw machine for napped artificial leather was created. Then, the napped artificial leather is treated with a liquid flow dyeing machine at a temperature of 120 ° C. for 10 minutes to perform a softening treatment, and then impregnated with an aqueous dispersion having a solid content of 0.4% of amino-modified silicone and imparted at 130 ° C. A fluffy artificial leather was obtained by drying in. The content of the second polyurethane contained in the fluffy artificial leather was 0.5% by mass, and the total ratio of the first polyurethane and the second polyurethane was 10% by mass.

In this way, a non-woven fabric of polyester fibers having a fluffy surface on one side and containing 5% by mass of carbon black and having an average fineness of 0.2 dtex is contained, the thickness is 0.6 mm, the grain size is 310 g / m ² , and the apparent density is 0. A dark black napped artificial leather at .52 g / cm ^{3 was obtained.}

Then, the lightness of the obtained napped artificial leather, the peeling strength, the color transfer resistance to the multi-fiber mixed woven fabric at the time of heating and pressurization at the time of wetting and drying, the color transfer resistance to the vinyl chloride film, and the ultraviolet carbon. The dyeing fastness to arc light was evaluated as follows.

(Brightness L ^* )
Using a spectrophotometer (Minolta: CM-3700), the ^{brightness L *} value was obtained ^{from the coordinate values of the L *} a ^* b * color system on the surface of the napped artificial leather in accordance with JISZ 8729. .. The value is the average value of three points measured by selecting the average position evenly from the test piece.

(Strong peeling)
Two test pieces of 15 cm in length and 2.5 cm in width were cut out from the napped artificial leather. Then, two test pieces were superposed with a 100 μm polyurethane film (NASA-600, vertical 10 cm × horizontal 2.5 cm) interposed therebetween to obtain a stacked body. The polyurethane film is not overlapped on the 2.5 cm portions at both ends of each test piece. Then, using a flat plate heat press machine, the product was pressed for 60 seconds under the conditions of a temperature of 130 ° C. and a surface pressure of 5 kg / cm ² to adhere the stacked bodies to prepare a sample for evaluation. The obtained evaluation sample was gripped by the upper and lower chucks of the unbonded 2.5 cm portions using a tensile tester at room temperature, and the s-s curve was measured at a tensile speed of 10 cm / min. The median value of the portion where the s-s curve became almost constant was taken as the average value, and the value divided by the sample width of 2.5 cm was taken as the peeling strength. The value is the average value of three test pieces.

(Color transfer resistance during heating and pressurization when wet and dry to multi-fiber mixed woven fabric)
A multi-fiber mixed woven fabric (combined weave No. 1) woven so that cotton, nylon, acetate, wool, rayon, acrylic, silk, and polyester woven fabrics are woven in parallel, as specified in JIS L 0803 Annex JA, was prepared. .. In addition, a 10 cm × 4 cm test piece was cut out from the napped artificial leather. Then, according to the A-3 method of the dyeing fastness test method for JISL0850 hot pressing, a wet or dried multi-fiber mixed woven cloth is placed on a test table, and a wet or dried test piece is placed on the test table. Further, a wet or dried multi-fiber mixed woven cloth was placed on the test piece, and the test piece was left in a dry heat dryer set at 200 ± 1 ° C. for 60 seconds with a pressure of 4 kPa applied to the test piece, and then taken out. .. The series was determined for each woven fabric using a gray scale for contamination, and the series of the woven fabric of the material with the largest contamination was defined as the color transfer resistance series.

(Color resistance to vinyl chloride film)
A 3 cm x 2 cm test piece was cut out from the napped artificial leather. Then, a vinyl chloride film (white) having a thickness of 0.8 mm was placed on the napped surface of the cut napped artificial leather, and pressure was uniformly applied so that ^{the load was 750 g / cm 2.} Then, it was left for 16 hours in an atmosphere of 50 ° C. and a relative humidity of 15%. Then, the color difference ΔE between the vinyl chloride film before the color transfer and the vinyl chloride film after the color transfer was measured using a spectrophotometer and determined according to the following criteria.
Grade 5: 0.0 ≤ ΔE ^* ≤ 0.2
Grade 4-5: 0.2 <ΔE ^* ≤ 1.4
Grade 4: 1.4 <ΔE ^* ≤ 2.0
Grade 3-4: 2.0 <ΔE ^* ≤3.0
Grade 3: 3.0 <ΔE ^* ≤ 3.8
Grade 2-3: 3.8 <ΔE ^* ≤ 5.8
Level 2: 5.8 <ΔE ^* ≤ 7.8
Class 1-2: 7.8 <ΔE ^* ≤ 11.4
Grade 1: 11.4 <ΔE ^*

(Light fastness to ultraviolet carbon arc light)
Based on JIS L0842, the napped surface of napped artificial leather is irradiated with an ultraviolet fade meter (U48 manufactured by Suga Test Instruments Co., Ltd.), and test pieces are taken out every 20 hours and compared with gray scale for discoloration and fading, for a maximum of 100 hours. JIS grade was determined from the time until the No. 4 color difference occurred.

(Dignity <two colors and touch>)
A 20 cm × 20 cm test piece was cut out from a fluffy artificial leather. Then, the appearance and the tactile sensation of the fluffy surface of the test piece when visually observed were judged according to the following criteria.
A: When visually observed, there was no two-color feeling of the fiber and the polymer elastic body, and the feeling was smooth.
B: When visually observed, the colors of the fiber and the polymer elastic body were different, and a two-color feeling was observed, which was inferior in grace.
C: The fluffy surface has a rough feel and is inferior to the surface touch.
D: The color is light and the appearance is inferior.

The results are shown in Table 1 below.

[Example 2]
The napped artificial leather was prepared in the same manner as in Example 1 except that the number of islands of the island component resin was 50, the average fineness was 0.08 dtex, and the content ratio of carbon black contained in the island component resin was 8% by mass. Obtained. Then, the obtained napped artificial leather was evaluated in the same manner as in Example 1. The results are shown in Table 1.

[Example 3]
The napped artificial leather was prepared in the same manner as in Example 1 except that the number of islands of the island component resin was 5, the average fineness was 0.5 dtex, and the content ratio of carbon black contained in the island component resin was 1% by mass. Obtained. Then, the obtained napped artificial leather was evaluated in the same manner as in Example 1. The results are shown in Table 1.

[Example 4]
The polyurethane concentration of the first polyurethane emulsion was changed from 15% by mass to 21% by mass, and the temperature was 120 ° C. for 10 minutes using a liquid flow dyeing machine to perform a softening treatment, and then 90 ° C. was included. A napped artificial leather was obtained in the same manner as in Example 1 except that the gold dye (black / blue mass ratio 50/50 mass%) was dyed with gold in a 5% owf dyeing bath and dried at 120 ° C. .. Then, the obtained napped artificial leather was evaluated in the same manner as in Example 1. In Example 4, it was dyed with a gold-containing dye and adjusted to be bluish. The results are shown in Table 1.

[Example 5]
After changing the polyurethane concentration of the first polyurethane emulsion from 15% by mass to 21% and treating it with a liquid flow dyeing machine at a temperature of 120 ° C. for 10 minutes for softening treatment, a sulfide dye (black / A fluffy artificial leather was obtained in the same manner as in Example 1 except that it was dipped and nip-treated in a 5% owf dyeing bath having a mass ratio of blue (50/50% by mass) and then dried at 120 ° C. Then, the obtained napped artificial leather was evaluated in the same manner as in Example 1. In Example 5, it was dyed with a sulfur dye and adjusted to be bluish. The results are shown in Table 1.

[Example 6]
The polyurethane concentration of 1% by mass of the second polyurethane emulsion was changed to 5% by mass, and the water-dispersed carbon black pigment and the water-dispersed blue pigment (mass ratio 50/50% by mass) were added to the second polyurethane emulsion in terms of solid content. A 1% by mass mixed emulsion was impregnated as a second polyurethane emulsion and dried at 130 ° C. to obtain a fluffy artificial leather in the same manner as in Example 1. Then, the obtained napped artificial leather was evaluated in the same manner as in Example 1. In Example 6, the mixture was colored with a water-dispersed blue pigment and adjusted to be bluish. The results are shown in Table 1.

[Example 7]
A fluffy artificial leather was obtained in the same manner as in Example 6 except that the first polyurethane emulsion was not impregnated. Then, the obtained napped artificial leather was evaluated in the same manner as in Example 1. The results are shown in Table 1.

[Comparative Example 1]
The number of islands of the island component resin is 50, the average fineness is 0.08 dtex, the content ratio of carbon black contained in the island component resin is 5% by mass, the area shrinkage before and after the moist heat shrinkage treatment is 25%, and the first Example 1 except that the polyurethane concentration of 15% by mass of the polyurethane emulsion was changed to 30% by mass and an emulsion containing 5% by mass of carbon black with respect to the first polyurethane was used as the first polyurethane emulsion. In the same manner as above, a napped artificial leather was obtained. Then, the obtained napped artificial leather was evaluated in the same manner as in Example 1. The results are shown in Table 1.

[Comparative Example 2]
A napped artificial leather was obtained in the same manner as in Example 1 except that the number of islands of the island component resin was 90 and the average fineness was 0.05 dtex. Then, the obtained napped artificial leather was evaluated in the same manner as in Example 1. The results are shown in Table 1.

[Comparative Example 3]
The number of islands of the island component resin was 90, the average fineness was 0.05 dtex, and the content ratio of carbon black contained in the island component resin was 11% by mass. Got Then, the obtained napped artificial leather was evaluated in the same manner as in Example 1. The results are shown in Table 2.

[Comparative Example 4]
The number of islands of the island component resin is 2, the average fineness is 1.1 dtex, and the content ratio of carbon black contained in the island component resin is 2% by mass. Got Then, the obtained napped artificial leather was evaluated in the same manner as in Example 1. The results are shown in Table 1.

[Comparative Example 5]
The content ratio of carbon black contained in the island component resin was set to 0.4% by mass, 15% owf of the dispersion dye was added using a liquid flow dyeing machine, and the temperature was 120 ° C. for 60 minutes to perform the dispersion dyeing treatment, 70 ° C. A napped artificial leather was obtained in the same manner as in Example 1 except that the alkali washing treatment, the water washing and the drying treatment were carried out for 20 minutes. Then, the obtained napped artificial leather was evaluated in the same manner as in Example 1. The results are shown in Table 1.

Referring to Table 1, all of the napped artificial leathers of Examples 1 to 7 have a peeling strength of 3 kg / cm or more, a lightness L ^* value ≤ 20, and a good dark color development property, and are made of a multi-fiber mixed woven fabric. The color transfer resistance during heating and pressurization during wet and dry conditions is 4th grade or higher under both dry and wet conditions, and the color transfer property of vinyl chloride film is ΔE ^* ≤ 2.0, and the appearance is graceful. Was also excellent. On the other hand, the fluffy artificial leather of Comparative Example 1 does not have the second polymer elastic body, so that the peeling strength is low, the color transfer resistance to the multi-fiber mixed woven fabric is also inferior, and the polymer elastic body is contained. Due to the high proportion, the appearance was also noticeable in two colors, and the surface touch was rough. In addition, the napped artificial leather of Comparative Example 2 did not develop a deep dark color because the average fineness was too low. Further, in the napped artificial leather of Comparative Example 3, the ratio of carbon black contained in the fibers was too high, so that the fiber strength was lowered and the peeling strength was low. In addition, the napped artificial leather of Comparative Example 4 was excellent in dark color development because of its high average fineness, but its surface was rough and of low quality. Further, the napped artificial leather of Comparative Example 5 dyed with the disperse dye was inferior in light resistance and color transfer resistance.

The napped artificial leather obtained by the present invention is preferably used as a skin material for clothing, bags, shoes, furniture, car seats, miscellaneous goods and the like. In particular, even when it is processed by applying heat or when it is brought into contact with various materials or various colors, color transfer is unlikely to occur, and it is also excellent in light resistance.

Claims (10)

A non-woven fabric containing polyester fibers having an average fineness of 0.07 to 0.9 dtex and a polymer elastic body imparted to the non-woven fabric are included.
The non-woven fabric is an entanglement of fiber bundles of the polyester fibers.
The polymer elastic body includes a first polymer elastic body existing outside the fiber bundle and a second polymer elastic body existing inside the fiber bundle.
The polyester fiber contains 0.5 to 10% by mass of a dark pigment and contains 0.5 to 10% by mass.
The content ratio of the second polymer elastic body is 0.1 to 3% by mass.
At least one surface of the polyester fiber has a raised surface, and the raised surface has a ^{lightness L *} value ≤ 20 ^{based on the L *} a ^* b * color system.
The color difference series judgment using the gray scale for contamination of the color transfer property evaluation under the conditions of wetness to the multi-fiber synthetic woven fabric (composite weave No. 1), load 4 kPa, 200 ° C., 60 seconds, is 4th grade or higher. A fluffy artificial leather characterized by being. The napped artificial leather according to claim 1, wherein the polymer elastic body does not contain a dark pigment or contains a range of 0 to 20% by mass. The napped artificial leather according to claim 1 or 2, wherein the second polymer elastic body contains a dark pigment. The napped artificial leather according to any one of claims 1 to 3, which is not dyed. The napped artificial leather according to any one of claims 1 to 3, which is dyed with a gold-containing dye or a sulfur dye. The napped artificial leather according to any one of claims 1 to 5, wherein the dark pigment contains carbon black. The napped artificial leather according to any one of claims 1 to 6, wherein the polyester fiber is an isophthalic acid-modified polyester fiber. Color difference series judgment using a gray scale for color transfer during heating and pressurization under the conditions of drying on a multi-fiber synthetic woven fabric (composite weave No. 1) and a load of 4 kPa, 200 ° C., 60 seconds is grade 4 or higher. The napped artificial leather according to any one of claims 1 to 7. The napped artificial leather according to any one of claims 1 to 8, wherein the color difference series determination using the gray scale for discoloration and fading is 4th grade or higher in the light fastness test for ultraviolet carbon arc lamp light conforming to JIS L0842. .. Load 750g / cm ^2, 50 ℃, before and after the color transition in a color transition evaluation to vinyl chloride film in conditions of 16 hours the color difference vinyl chloride film, of claims 1 to 9 is a Delta] E ^* ≦ 2.0 The napped artificial leather according to any one of the items.